Fuel saver



May 1935- J. BLAKEMAN 2,002,879

FUEL SAVER Filed Aug. 6, 1934 \4- a I 7 \2 l \o C) 8 CD CD C) INVENTOR JAMES BLAKE MAN TTORNEYS Patented May 28, 1935 UNITED STATES PATENT OFFICE FUEL SAVER Application August 6, 1934, Serial No. 738,731

3 Claims.

My invention relates to improvements in fuel savers which are particularly adapted for fitting to the smoke pipe of a furnace, boiler or range.

The objects of the invention are to provide means for preventing surges in the main flue from influencing the fire and from drawing the heat of the fire away from the zone where it is to be usefully employed. In fuel savers of this and similar types where auxiliary air is admittted to the flue heavy soot precipitation develops at the point of entry of such air, and it is a. further object of the invention to overcome this objection.

The invention consists essentially of a tube surrounded by a jacket, said tube being so formed as to cause the gas flow therethrough to converge adjacent the point of entry and having orifices to admit auxiliary air drawn through the jacket, as will be more fully described in the following specification and shown in the accompanying drawing, in which:

Fig. 1 is a sectional view of the invention.

Fig. 2 is an elevational view of the device showing a modified form of damper.

In the drawing like characters of reference indicate corresponding parts in each figure.

The numeral I indicates generally a pipe leading from a furnace to a flue, not shown, in which is fitted a jacket generally indicated by the numeral 2. The jacket preferably consists of cast heads 3 and 4, and a cylindrical shell 5.

The head 3 consists of a frustum 6 having a cylindrical band 1 at one end which fits into the stove pipe and receives the entering end of a sleeve 8.

The head 4 is provided with an annular rim 9 supported from a band It! by an apertured flange H, and rockingly mounted upon the flange is a ring l2 having apertures l3 corresponding with those of the flange II and having also a lever M by which the ring can be turned to vary the air opening through the flange and the ring to the interior of the jacket 2. The band Ill serves to hold the outlet end of the sleeve 8.

The sleeve 8 is provided with rows of apertures I5 and 16, the apertures l5 are disposed beyond the jacket adjacent the entering end of the device and are adapted to pass gases of combustion from the inner periphery of the smoke pipe through the wall of the sleeve at an angle to the general straight line flow through the sleeve, and the apertures l6 are adapted to admit air entering the jacket 2 to the sleeve 8, also at an angle to the general gas flow therethrough.

The entering end of the sleeve 8 is preferably inturned as at IT to increase the volume of gases passing into the annular space between the sleeve and pipe and increase their velocity in passing through the apertures l5 into the sleeve.

In operation, the gases, which normally flow 5 through smoke pipes in an irregular spiral stream, pass in part along the axis of the sleeve 8 and in part outside the inner end of said sleeve and into it through the apertures 55, thus setting up a converging stream immediately ahead of the apertures l5. This converging gas stream carries some solid particles and keeps them in suspension until they are well beyond the apertures 16, so that the jacket is kept quite clear of soot deposit.

When external wind currents produce surges of draught in the flue, cool air in proportion is drawn into the sleeve through the apertures 16, thus checking the draught to. the fire, preventing heat losses, and effecting substantial savings in the fuel. The inturned rim I! of the sleeve 8 directs a larger volume of gases through the apertures l5, thus increasing the velocity of flow therethrough and producing a greater convergence of the gas stream within the sleeve and a correspondingly greater solid particle carrying capacity to the gas stream.

What I claim as my invention is:

1. A fuel saver adapted for connection to a smoke pipe and a flue comprising a shell enclos ing a sleeve, means for passing gases from the smoke pipe to the sleeve through its outer periphery, and means for passing auxiliary air through the shell into the sleeve.

2. A fuel saver comprising a shell adapted for connection to a smoke pipe and a flue, a sleeve within the shell, said sleeve projecting beyond the length of the shell to define an annular space between it and the smoke pipe and having a plurality of apertures about its periphery, and means for passing auxiliary air through the shell and into the sleeve.

3. A fuel saver comprising a shell adapted for connection to 'a smoke pipe and a flue, a sleeve within the shell, said sleeve projecting beyond the length of the shell to define an annular space between it and the smoke pipe and having a plurality of apertures about its periphery, and means for passing auxiliary air through the shell and into the sleeve, the projecting end of said sleeve 5[) being constricted to less than its average cross sectional dimension.

JAMES BLAKEMAN. 

